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Mars is the obvious frontrunner, but it is far from an easy second home. The other candidates reveal just how rare truly human-friendly conditions may be.

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US officials canceled NASA’s ambitious Mars Sample Return program, leaving potential evidence of ancient life sitting on Mars ...

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Flat Earth theory can be tested without relying on space photographs or one institution. Several independent observations ...

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A second-generation planet might be orbiting a white dwarf, in an astronomy first, according to new research.